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May 9, 1933. A A, HORTON CALCULATING MACHINE Original Filed Jan. 29,1926 5 Sheets-Sheet 1 INVENTOR Wu/ M BY n" A X4; fluu, kla @nu17ATTORNEYS May 9, 1933. A. A. HORTON CALCULATING MACHINE Original FiledJan. 29, 1926 5 Sheets-Sheet 2 7&4 @M

ATTORNEY5 V/ BY May 9, 1933. A. A. HORTON CALCULATING MACHINE OriginalFiled Jan. 29 1926 5 Sheets-Sheet 3 INVENTO BY 4 M Z A J y "f 6/ATTORNEYSJ4 May 9, 1933. A. A. HORTON CALCULATING MACHINE Original FiledJan. 29, 1926 5 Sheets-Sheet 4 INVENTOR 0 I We B w J v40! :7 ATTORNEY A.A. HORTQN may 9 E9330 CALCULATING MACHINE Original Filed Jan. 29 1926 5Sheets-$heet 5 Patented May 9, 1933 UNITED STATES ALLEN A. HORTON,DECEASED, LATE OF DETROIT, ITIO'HTGAN, BY KATHLEEN" E.

HORTON, F PLYMOUTH, MICHIGAN, AND DETROIT TRUST COMPANY, SUGCESSOB TODETROIT AND SECURITY TRUST COMPANY, OF DETROIT, MICHIGAN, EXECUTORS,ASSIGNORS TO BURROUGHS ADDING.- MCHTNE COMPANY, 015' DETROIT, MIGHIGAN,

A CORPORATION OF MICHIGAN CALCULATING MACHINE Orginal application filedJanuary 29, 1926, Serial No. 84,616. Divided and this application filedMarch 2,

1931. Serial This invent on relates to a calculating machine. Thepresent application is a division of co-pending application Serial No.84,616 filed January 29, 1926, now Patent No. 1,853,- 050.

The invention relates particularly to what is known as a duplex type ofmachine, that is, a machine having two registers or counters.

The object'of the invention is to provide an improved machine of thistype, the particular objects and advantages of the construction beingpointed out in the following specification and claims.

An embodiment of the invention is shown in the accompanying drawings inwhich:

Figure 1 is a side elevation of the machine with the casing removed, theView showing particularly the controlling devices.

Fig. 2 is a detail rear elevation of certain of the control membersshown in Fig. 1;

Fig. 3 is a partial side elevation showing the mechanism for moving theregisters into and out of engagement with the actuator racks;

Fig. 4 is a side elevation and section showing how the duplex registersare associated with the other mechanism of the machine;

Fig. 5 is a partial side elevation and section of one of the registersand its transfer mechanism, the view showing the register in engagementwith the actuator racks and the transfer mechanism in the position itoccupies after an initial carry has occurred;

. Fig. 6 is a view similar to Fig. 5, the counter being shown out ofengagement with the racks and the transfer mechanism in the position itoccupies after a transfer has been effected;

Fig. 7 is a detail side elevation of the controls for the duplexregisters, the parts being shown in the position they occupy when thelower register is being used;

Fig. 8 is a detail side elevation similar to Fig. 14 showing the partsin the position they occupy when the upper register is being used;

Fig. 9 is a detail side elevation of the con trols including certainconnections operated by the total and sub-total keys;

Fig. 10 is a detail side elevation showing the character printingcontrols including the connections operated by the non-add key;

Figs. 11, 12, 13 and 14: are detail side views of the controls forcharacter printing;

Fig. 15 is a top plan view of a portion of the duplex register section.

No attempt will be made in this case to use the same reference numeralsas were used in the parent case because the reference numerals in thatcase were necessarily of high order, that is, they began with 236. Thepresent description and drawings can be simplified by using referencenumerals of lower order and this will be done.

General construction Referring to Fig. 4:, the machine includes akeyboard provided with a plurality of depressible amount keys 21 which,when depressed, act as stops for diiierential stop bars 22 that areurged forwardly by springs 23. There are a plurality of rows of thesedevices but only one now will be described. The stop bar 22 is connectedat its rear ends to the arm 24 of an actuator rack25. Connected to theactuator rack 25 is a type bar 26 adapted to be thrown into printingengage ment with a paper on a platen 27 by means of a hammer mechanism28.

When the machine is given a stroke of operation, a main shaft 30 isfirst rocked counterclockwise during the forward stroke of the machineand then returned clockwise during the return stroke. This also rocksthe operating cam 31 in like manner. As the cam moves counterclockwisefrom its Fig. lposition, it releases a roller'32 on the end of an arm 33connected to a bail 34; that normally engages the actuator racks 25 tohold them in their normal position. When the roller 32 is released, aspring 35 swings the arm 33 and hail 3d counterclockwise and releasestheactuator racks whereupon these racks to gether with the stop bars 22are moved forward by their springs23 until arrested in differentialpositions by depressed amount reys.

Upon the return stroke of the machine, the drive shaft 30 is rockedclockwise where upon the cam 31 engages the roller 32 and tit) iltllllrocks the bail 34 clockwise to return the actuator racks from theirdifferential positions to their normal positions.

Duplex registers The machine is provided with two registers, the upperone being numbered 40 and the lower one 50. These registers and theirtransfer mechanisms are similar in construction and operation and, inorder to simplify the description, only the upper one will be described,it being understood that the lower one is of the same construction.

Referring to Fig. 3 the register 40 comprises a plurality of toothedpinions rotatably mounted on a shaft 41 supported by the arms 42 of ayoke which rocks with a shaft 43 to rock the register into and out ofengagement with the actuator racks 25. A cam 44 is provided forcontrolling the movement of the register, said cam being carried on onearm of a yoke 45 rocked with the shaft 46 in a manner hereafterdescribed. The edge of the cam 44 bears against a roller 47 on the endof shaft 41, the roller being urged into engagement with the edge of thecam by a spring 48.

The lower register 50 is mounted and controlled in the same way by a cam51 rocking with a shaft 52.

Cooperating with each register is a transfer mechanism, one of saidmechanisms being shown in detail in Figs. 5 and 6. It comprises atransfer segment 53 normally latched against movement in a clockwisedirection by a latch 54. A trip pawl 55 is provided adapted to be swungclockwise by a transfer projection on a corresponding pinion of theregister. When the pawl is moved clockwise to the position of Fig. 5 itis latched in this position by a latch 56. When the register is movedout of engagement with the actuator racks and into engagement with thetransfer segments, the latched pawls 55 move with the register andengage the latches 54 to release them thereby permitting the transfersegments to effect carries in the orders in which such carries should beeffected. An understanding of the details of the transfer mechanism isnot necessary for the present case, said transfer mechanism being fullydescribed in Patent No. 1,781,179.

Selective control of the registers Either or both of the registers maybe brought into engagement with the actuator racks by means of a mainpitman operating under the control, in the embodiment illustrated, of alever 61 as will now be described.

The pitman 60 (Fig. 1) is mounted to slide back and forth on one of theside plates of the machine, the pitman being supported at its front endby a stud 62 and at its rear end by a stud 63. The forward end of thepitman is forked or U-shaped and pivoted to the upper arm 64 of the U isa shouldered pawl 65 urged to the position of Fig. 1 by a spring 66.Pivoted on the lower arm 67 of the pitman is a pawl 68 controlled by thetotal and subtotal keys as will be later described. The lower arm of thepitman has a hook-shaped end 69 for a purpose that will presentlyappear..

Reciprocation of the pitman 60 is effected by studs 70 and 71 on a platethat rocks with the main drive shaft 30 of the machine.

In normal operation, the parts are in the position of Fig. 1. The pawl68 is out of the path of the stud'7 j" and there is nothing in the pathof the stud 71. Accordingly, as the main drive shaft 30 rockscounterclockwise neither of the studs 70 or 71 have any action in movingthe pitman 60. Near the end of the forward stroke of the machine thestud 71 moves behind the shoulder on the pawl 65 and, upon the returnstroke of the machine, this stud engages the shoulder on the pawl 65 tomove the pitman 60 rearward. As will be described later, this results inrocking one or both of the registers into engagement with the actuatorracks prior to the descent of the latter so that addition may beperformed.

\Vhile the pitman 60 thus serves to move the registers, the selection ofwhich register shall be moved isunder the control of a lever 61.

Referring to Figs. 7 and 8, it will be observed that two V-shapedmembers are pivoted to the right hand end of pitman 60, each of saidmembers having one long and one short arm. One member has an up r longarm 72 and a lower short arm 73. he other member has a lower long arm 74and an upper short arm 75. The two short arms are connected by a spring7 6'.

The upper long arm 72 has a slot 77 in its outer end and ahook-shapedprojection 78 adapted to engage over a stud 79 on an arm 80 of a yoke 45which moves the operating cam 44 for the upper register.

The lower arm 74 has a slot 81 in its outer end and a hooked shapedprojection 82 adapted to engage over a stud 83 on an arm 84 of the yoke85 that rocks the operating cam 51 for the lower register.

When the parts are in the position of Fig. 7 the lower long arm 74 ishooked to the operating cam for the lower register so that, when thepitman 60 is moved, the lower register will be moved while the upperregister remains stationary.

When the parts are in the position of Fig. 8 the upper long arm 72 ishooked to the operating cam for the upper register so that, when thepitman 60 is moved, the upper register will be moved while the lowerregister will remain stationary.

The position of these arms 72 and 74 is controlled by the lever 61.Connected to the lever 61 is a link 86 having a stud 87 near its frontend. (Jo-operating with this stud is a spring pressed detent 88 thatserves to hold the lever 61 in any one of the three positions to whichit may be moved. The rear end of the link 86 is connected to one arm ofa three armed lever 90 pivoted at 91. The rearwardly extending arm 92 ofthis lever 90 carries a stud 93 positioned to engage the inner edges ofthe short arms 73 and 75.

When the lever 61 is in its intermediate position, as shown in Fig. 1,the stud 93 is midway between the short arms 73 and 75. At that time thespring 76-tends to bring the arms 73 and 75 together which swings thelong arms 72 and 74 outwardly to the position of Fig. 1 so that both of.these long arms are hooked to the operating cams for their registers.Accordingly, when the control lever 61 is in its intermediate position,both of the register operating cams are connected to the pitman 60 sothat, when the pitman is moved, both registers will be moved.

When the control lever 61 is pulled forward to the position of Fig. 7,the threearmed lever 90 is rocked clockwise and the stud 93 contactingthe arm 73 swings this arm clockwise which carries the long arm 72 tothe position of Fig. 7 so that stud 79 is out of slot 77. The downwardmovement of arm 7 3 tensions the spring 76 which, of course, tends tourge the long arm 74 more firmly into engagement with its stud 83. Withthe parts in this position the lower register operating cam is connectedto pitman 60 but the upper register cam is not.

When the control lever 61 is pushed rearward to the position of Fig, 8,the threearmed lever 90 is rocked counterclockwise and the stud 93forces the short arm 75 upward which swings the long arm 74 upward tothe position of Fig. 8 where the slot 81 is moved away from the stud 83.The spring 76 is again tensioned but, this time, it tends to urge thelong arm 72 into engagement with the stud 79. With the parts in thisposition, the upper register operating cam is connected to the pitman 60and the lower register operating cam is disconnected.

Suitable interlocking means is provided for preventing movement of thelever 61 after a machine operation has started. As the machine isoperated the end of a shaft 94 shown in Fig. 1 moves either above orbelow an arm 95 integral with lever 61 or it moves into a slot 96 in theend of said arm, depending on whichof its three positions the lever 61occupies. This prevents movement of the lever after operation of themachine has started- This interlocking device not only prevents movementof the lever 61 while the machine is in operation but it preventsoperation of the machine if the lever 61 is not in correct position.Should the lever 61 not be in correct position the end of the shaft 94will engage the edge of the arm 95 which causes the driving means of themachine to be disconnected from the operating mechanism as is describedin the parent application.

Totals and subtotals When a .total is, taken, the register from which itis taken must be moved into engagement with the actuator racks beforethey ascend so that the register will control the differential positionsto which the racks move, the register pinions being arrested in theirzero position. If the register is to be cleared after the taking of atotal it is .moved out of engagement with the actuator rack prior to thedescent of the latter. On the other hand, if only a subtotal is to betaken the register is allowed to remain in engagement with the racks sothat, during their descent, the pinions are returned to the positionthey occupieil immediately before the taking of a subtcta v The totalkey T (Fig. 1), has a stem positioned to engage the edge of a pivotedlever 100 carrying a stud 101 engaging a yielding slide 102 connected tothe pawl 68 so that, upon depression of the total key, the pawl 68 isrocked clockwise into the path of the stud 70. At the same time thelever 100 engages an arm 103 pivoted on the pitman 60. This arm has ahook shaped end 104 which is moved into the path of the stud 71. It alsohas a central projection 105 for disabling pawl 65.

With the parts in the position of Fig. 1, depression of the total keyand operation of the machine causes the following action to take place.At the beginning of the forward stroke the stud engages the end of thepawl 68 and moves the pitman 60 rearwardly which causes the registerconnected with the pitman to be rocked into engagement with the actuatorracks. At the end of the forward stroke the stud 71 engages the hookedend 104 of the arm 103 and pulls the pitman 60 forwardwhich rocks theregister out of engagement with the actuator racks. Upon the returnstroke, the pawl 65 having been disabled by projection105, no furthermovement of pitman 60 takes place. Stud 70 does not engage the hookedend 69 of the lower arm 67 of the pitman because the pitman has alreadybeen moved forward.

When the subtotal key ST is depressed, it engages the end of a pivotedmember 106 which engages the end of the linkage 102 to rock the pawl 68clockwise. It is to be noted that the depression of the subtotal keydoes not move the arm 103 and hence does not disable pawl 65.

When the subtotal key is depressed and the machine operated the partsoperate as follows At the beginning of the forward stroke. the stud 70engages the end of pawl 68 and moves the pitman rearwardly which rocksthe register connected to the pitman into engagement with the actuatorracks. At the end of the forward stroke, the stud 71 does not engage thehooked end 104 of the arm 103 and the pitman 60 remains in its rearwardposition. At the beginning of the return stroke, stud 71 would engagepawl except for the fact that the pitman is already in its rear positionso that the pawl is out of the path of the stud. Accordingly, thepitmanremains in its rear position until near the end of the return strokewhen the hooked end 69 of the lower branch 67 of the pitman is engagedby stud 70, whereupon the pitman is pulled forward to rock the registerout of engagement with the actuator racks.

A total or a subtotal may be taken from either register depending uponthe position of the control lever 61. If this control lever is in aposition to render the upper register active and the lower registerinactive, the total or subtotal will be taken from the upper register.If, on the other hand, the lever 61 is in position to render the lowerregister active and the upper register inactive, the total or subtotalwill be taken from the lower register.

If the control lever 61 is in its intermediate position so that bothregisters are active, provision is made to cause the total or subtotalto be automatically taken from the lower register. In order that thisresult may be accomplished, the following construction has beenprovided:

Pivoted at the lower rear corner of the machine, as shown in Fig. 1, isa long arm having an upstanding lug 111 at its forward end. At thecenter of this long link is a downwardly extending cam projection 112(Fig. 9) adapted to rest on a stud 113 on one arm of a member 114pivoted at 115 toth e three armed lever 90. The member 114 has anotherarm 116 provided with a stud 117 positioned over the upper edge of theshort arm 73 of one of the V-shaped members pivoted to the pitman 60.

When the control lever 61 for the two registers is in its centralposition so that both registers are active, the cam projection 112 ofthe link 110. rests on the stud 113% shown in Fig. 9. If, with the partsin this position, the total or the subtotal key is depressed, the levers100 or 106 as the case may be will be rocked counterclockwise. Both ofthe levers 100 and 106 have portions positioned to engage the lug 111 onlink 110. Depression of either of these keys will swing the link 110counterclockwise. This rocks the member 1l4116 clockwise and forces thearm 73 downward. which forces the long arm 72 down to disconnect it fromthe upper register controlling cam. Accordingly, the act of pressing thetotal or subtotal key, with the lever 61 in central position, acts toautomatically disconnect the upper register and leaves the lowerregister in condition so that the total or subtotal will be taken fromit.

When the total or subtotal keys are released and returned to normal inthe usual manner at the end of the totalizing or subtotaling operationsof the machine, the link 110 is released, whereupon it is returned tonormal by the spring 76 acting on arm 73, stud 117, bell crank 116--114and stud 113. This action of spring 76 also returns the V- shaped member7372 to register-connecting position so that, at the end of the totalingor subtotaling operation, the machine is in condition again for both ofthe registers to be active during item entering operations. In otherwords, when the machine is conditioned to re ister items on bothregisters, a total or su total can be taken from one of the registers bysimply depressing the total key and operating the machine, after whichitems can be entered in both registers again without changing thecondition of the register controlling means.

When the control lever 61 is swung either forwardly or backwardly fromits central position, the three armed lever 90 is moved from its Fig. 9position either forward or backward and the member 114 is carried withit so as to remove the stud 113 from under the 'cam projection 112 onlink 110. This allows the link to drop so that its lug 111 is out of thepath of the levers that are rocked by the total and subtotal keys.Accordingly, when the control lever 61 for the registers is in eitherits upper or its lower register position, the automatic control abovedescribed is disabled.

Character printing It is desirable to print characters indicating inwhich register items have been entered and also indicatingthe characterof the calculation that has occurred in each register. Characterprinting devices have been provided for accomplishing this purpose.

A special actuator segment and type bar (not shown) is provided, theseparts being of the same construction as corresponding parts illustratedin Fig. 4. The character printing actuator rack and type bar, instead ofbeing controlled by a stop bar and amount keys, are controlled by an arm120 (Fig. 10) of a yoke 121 having a second arm 122 provided with a slotengaging over a stud connected with the actuator rack. The position ofthe arm 120 is determined by stop arms controlled by various controllingkeys and levers on the machine.

e will first explain the control of the character printing type bar bythe lever 61 that controls which of the registers shall be active.

Referring to Fig. 10, it will be observed that the three armed lever 90,whose position is controlled by the link 86 operated by the lever 61carries a stud 123 adapted to engage the end of an arm 124 of a yoke 125pivoted at 126. This yoke has a forwardly extending irregular shaped arm127 provided with various shoulders adapted to be engaged by a laterallug 128 on the upper end of the'arm 120.

The arm 120 normally occupies a position clockwise from that shown inFig. 10 with the lug 128 in the large U-shaped opening in the arm 127.When the machine is operated, the arm 120 is released so that it rockcounterclockwise until its lug 128 engages one of the shoulders that ispositioned to arrest it. This, of course, arrests the character printingtype bar.

When the control lever 61 is in its position for using the lowerregister only, the three armed lever 90 is in a position slightlyclockwise from the position of Fig. 10 and the yoke 125 with its member127 occupies a position slightly clockwise from that shown. When the arm120 is released, it is arrested immediately by the shoulder LA, meaninglower counter-addition.

The character type bar is not moved from normal position so that nocharacter is printed. The operator knows that when no character isprinted, the item is added in the lower counter.

When the control'lever'61 is moved to its intermediate position whichrenders both registers active, the three armed lever 90 is rocked to theposition of Fig. 10 and the yoke 125 isrocked in the same direction sothat the parts occupy the position of Fig. 10. When the arm 120 isreleased, it moves counter-clockwise until the .lug 128 strikes theshoulder 130. This arrests the character type bar in a position to printa character indicating that the item has been added on both registers.

When the control lever 61 is moved farther to the rear, that is, to theposition for making the upper register active, the three armed lever 90is rocked still farther counterclockwise which rocks the yoke 125clockwise from the position of Fig. 10 to a position such that none ofthe shoulders on the member 127 are in the path of the lug 128 on arm120. Accordingly, when the machine is operated and the arm 120 isreleased, the arm moves until it strikes a fixed stud 131 which arreststhe character type bar in a position to print a character indicatingthat the item has been added on the upper register.

Sometimes items are not added in either register and it is desired toindicate this on the printed record. 7 The non-add key NA (Fig. 10) hasa stem adapted engage a pivoted lever 132 whose outer end is enlargedand positioned to engage a projection 133 on the arm 127. When t enon-add key is depressed, the arm 127 is rocked counterclockwise to aposition such that the shoulder NA. is in the path of the lug 128. Withthe parts in this position,-wh-en the machine is operated, the arm 120moves forward a slight distance to a position such that the type bar isarrested in position to print a character indicating that an item hasnot been added in either register.

lVhen a total or subtotal is taken it is desirable to have the characterindicate Whether the operation is a total or a subtotal and on whichregister it occurs.

it will be recalled that a total is taken from the lower register whenthe control lever 61 is in either its forward position for renderingonly the lower register active or in its central position for causingboth registers to be active. This fact must be kept in mind inconsidering the operation of the character printing mechanism.

When the total key is depressed, it rocks the lever 100 (Fig. 11)counterclockwise and the lower edge of this lever engages a lateral lug134 10) on' the member 127. This inovesmember 127 to a position "suchthat none of its shoulders will interfere with the forward movement ofthe arm 120 and this occurs no matter whether the control lever 61 is inits forward or in its central position. The character printing is thustaken out of the control of the arm 127 and placed under the control ofcertain other stop arms positioned by the total and subtotal keys asfollows:

The lever 100 that is rocked by depression of the total key is, in fact,one arm of a yoke 140 pivoted on the stud 141 shown in Fig. 2. This yokehas another short arm 142 11) which is positioned behind another yoke143 that has a forwardly entendingstepped arm 144. The arm 144 isconnected by a spring 145 to a projection 146 on a yoke 147 having astepped arm 148. A spring 149 tends to hold both arms 144 and 148 in theposition shown in Fig. 11. However, when the lever 100 is movedcounterclockwise by depression of the total key, the short arm 142 otthe yoke 140 rocks the yoke 143 counterclockwise which rocks arm 144downward. The arm 148 tends to follow but is arrested by the cam end 150on a third arm 151 of the three armed lever 90. It will be recalled thatthe three armed lever 90 is positioned by the control lever61. When thecontrol lever 61 for theregisters is in its lower register or itsintermediate position, the cam surface 150 is under a portion of theyoke 147 and moviement of the yoke with its stop arm 148 is prevented.When the parts are in this position, if the total key is depressed, thearm 100 rocks the yoke 140 counterclockwise and this positions the stoparm 144 as shown in Fig. 13, the arm 148 being blocked against movement.This position of arm 144 positions the stop shoulder LT in the path ofthe lug 128 on arm 120 and, upon operation of the machine, said arm isstopped in the position to arrest the character type bar in a positionto print a character indicating that a total has been taken from thelower register.

If a subtotal is taken from the lower register instead of a total, thecontrollever 61 being either in its forward or central position, theaction is slightly diflerent and as follows:

Depression of the subtotal key ST moves the arm 106 counterclockwise.This arm is connected to a yoke 153 (Fig. 2) having a short arm 154positioned behind yoke 143. The movement given yoke 143 by depression ofthe subtotal key is slightly more than when the total key'is depressedand it results in moving the stop arm 144 to the position shown in Fig.12 where the shoulder LST is in the path of the lug on arm 120. The arm148 is blocked against movement as previously described. The result isthat the character printing type bar is arrested in the position toprint a character indicating that the subtotal has been taken from thelower counter.

When a total is taken from the upper register the control lever 61 mustbe in its rear position and, when it is in this position, the threearmed lever is rocked clockwise from its Fig. 11 iosition to" a positionsuch that the cam nose 150 of arm 151 is not under the yoke 147.Accordingly, when the total ke is depressed and the arm with its yokerocked counterclockwise, both of the stop arms 144 and 148 are rockedcounterclockwise. Since the shoulders on the arm 148 are ahead of theshoulders on the arm 144, the arm 148 instead of arm 144 will beefl'ective to arrest the arm 120. The result is that the arm 120 ispositioned so that the shoulder UT is in the path of the lug on arm 120and the character printing type bar is arrested in a position to print acharacter indicating that a total has been taken from the upperregister.

When a subtotal is taken from the upper register the parts operate asabove described, except that the subtotal key positions the arms insteadof the total key. When the subtotal key is depressed the arm 148 ismoved counterclockwise slightly farther than in the case of a depressionof a total key and the result is that the stop shoulder UST ispositioned in the path of the lug on arm 120 so as to arrest thecharacter printing type bar in a position to print a characterindicating that a. subtotal has been taken from the upper counter.

The machine thus automatically indicates what transaction has takenplace and in what register the operation has occurred. If it is'additionin the lower register, no character is printed. If it is addition in theupper register an appropriate character is is indicated. If a total istaken from a low-.

er register such fact is indicated regardless of whether the lever 61 isin its forward or central position. If a total or subtotal is taken fromthe upper register that fact is also shown.

What is claimed is:

1. A calculating machine having two registers, controlling means forconditioning said machine to render either or both of said registersactive, a total taking means, and means controlled by said total takingmeans acting to automatically select a predetermined one of saidregisters for total taking when said total taking means is conditionedfor total taking with said controlling means conditioned to render bothof said registers active.

2. A calculating machine having two registers, a pitman adapted to bereciprocated by operation of the machine, separate connections forconnecting said registers to said pitman, controlling means forrenderingeither or both of said connections effective, and total taking meanshaving provisions for automatically disabling one of said connectionswhen the total taking means is conditioned for total taking with thecontrolling means in position to render both connections effective.

3. A calculating machine having two registers, a pitman adapted to bereciprocated by operation of the machine, a connecting link between saidpitman and one of said registers, a connecting link between said pitmanand the other of said registers, controlling means for positioning saidlinks to cause either or both of said registers to be connected to saidpitman, and a total taking means having portions acting to automaticallymove one of said links to disable the connection to one register whenthe total taking means is manipulated to take a total while saidcontrolling means is positioned to cause both registers to be connectedto said pitman.

4. A calculating machine having two registers, a pitman adapted to bereciprocated by operation of the machine, a V-shaped link for connectingsaid pitman to one register, a second V-shaped link for connecting saidpitman to the other register, a controlling means for engaging one setof arms of said V-shaped links to move either or both of said links toconnected position, and a depressible total key having connections formoving one of said links upon depression of the total key when thecontrolling means is in position to cause both of said links to be inconnected position.

5. A calculating machine having two registers, a pitman reciprocated byoperation of said machine, a link for connecting said pitman to oneregister, a link for connecting said pitman to the other register, amanually III) movable means for positioning said links to *cause eitheror both of them to be: placed in .connected position, a memberconditioned for operation by movement of said manually movable means toposition for placing both of said links in connected position, and atotal key and connections for operating said member to disable one ofsaid links.

6. A calculating machine having amount keys, two registers, total takingmeans for said registers, controlling means for conditioning saidmachine to render either or both of said registers active to receiveitems entered on said amount keys, and means conditioned as an incidentto taking a total from said machine with said total taking means, whilesaid controlling means is conditioned to render both of said registersactive, for automatically disabling one of said registers for totaltaking. y 1

7. A calculating machine having actuator racks, amount keys, tworegisters, a total taking means for said registers, separate connectionsfor each register for controlling its movement into and outof engagementwith said racks, controlling means controlling said registerconnections, said controlling means,

when in one condition, conditioning both of said register connections tocause both of said registers to engage said racks as the machine isoperated to thereby enable both registers to receive items entered onsaid amount keys, and means conditioned as an incident to taking a totalfrom said machine with said total taking means, while said controllingmeans is conditioned to cause both of said registers to engage saidracks, acting to automatically disable one of said register connections.r

8. A calculating machine having amount keys, actuator racks, tworegisters, a total taking means for said registers, a reciprocablepitman reciprocated during each operation of the machine, separateconnections between each of said registers and said pitman for movingthe registers into and outof engagement with said racks, controllingmeans for said connections for selectively placing either or both ofsaid connections in condition to cause either or both of said registersto engage said racks'to receive items entered on said amount keys, andmeans conditioned as an incident totaking a total from said machine withsaid total taking means, while said controlling means is conditioned torender both of said register connections operable, acting toautomatically disable one of said connections.

9. A calculating machine having amount keys upon which itemsmay beentered, two

registers, register controlling means for conditioning said machine tocause bath of said registers to be rendered active during item enteringoperations, total taking means for taking totals from said registers,and means controlled as an incident to the taking of a total with saidtotal taking means, while said controlling means is conditioned torender both of saidregisters active, for automatically causing saidtotal to be taken from one of said registers and the other to berendered inactive.

10. A calculating machine having amount keys, two registers, a totaltaking means for taking totals from said registers, register controllingmeans for conditioning the machine to cause both of said registers to berendered active during item entering operations, and means acting as anincident to the taking of a total with said total taking means whilesaid controlling means is conditioned to render both registers activefor automatically causing a total to be taken from one of said registersand the other to be temporarily rendered inactive, said incidentalmeans, after said totaling operation, leaving said machine in conditionfor both registers to be rendered active during item enteringoperations, to thereby enable items entered on said amount keys to beagain entered in both registers without changing the condition of saidcontrolling means.

11. A calculating machine having amount keys, actuator racks, tworegisters, means for causing engagements between said racks andregisters for item entering and totaling operations, controlling meansfor conditioning the machine to cause engagements between both of saidregisters and racks during item entering operations whereby itemsentered on said amount keys will be entered in both registers, totaltaking means for taking totals from said registers, and means acting asan incident to the taking of a total with said total taking means whilesaid controlling means is conditioned to cause engagement between bothof said registers and said racks for preventing engagement between oneof said registers and said racks during said total taking operation,said incidental means, after said total taking operation, leaving saidmachine in condition to enable engagements to take place between both ofsaid registers and said racks during item entering operations wherebyitems entered on said amount keys subsequent to said total takingoperations may be entered in both registers without changing thecondition of said controlling means.

In witness whereof, we have signed our names this 18th day of February,1931.

[L. 5.] KATHLEEN H. HORTON,

. And DETROIT TRUST COMPANY, Successor to Detroit a? Security TrustCompany, Ea:-

eeutors under Will of Allen A. Horton, Deceased,

By SELDEN B. DAUIE,

Vice President, JOHN J. SPOUTZ, Assistant Secretary.

